Expert tip

Using the alsurface shader The alsurface shader allows for under and oversampling of all aspects of the shader – valuable when optimising scenes. Imagine you have two subsurface scattering shaders; one using the cubic model and another using the directional model. The latter needs more samples to clear up the noise. It’s better to add samples on the shader level rather than in the global settings, since otherwise the cubic model would receive more samples than needed.